Observed arrival · 2026-09-18
Paperplane: real mail for code
A REST, MCP, CLI, and web service for sending letters, postcards, and Certified Mail through USPS.
○Open
⊠Login
$Paid
†Ads
✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- Developers automating letters and Certified Mail
- Worth noticing
- The workflow previews an exact PDF before payment and supports MCP alongside REST, CLI, web, email, and text.
Field notes
The service accepts plain text or a PDF, automatically typesets the material, checks the address, and routes the resulting piece to USPS. Its examples cover Certified Mail, landlord and tenant notices, IRS replies, HOA appeals, and other documents where proof of mailing matters. The site exposes the same pipeline through MCP, REST, CLI, web, email, and text, while a free sandbox previews output without sending physical mail.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
$PaidCommerce or pricing visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use
ƒJavaScriptBrowser-side code central
One card from the complete issue